The number of people selected for this topic is mainly based on the statistics and evaluation of various data 12 hours after the start of the competition on each platform (see the note for the method), and finally the number of selected topics for the Huashu Cup in 2023 is roughly
| Question number | number of candidates |
| A | 120 |
| B | 159 |
| C | 420 |
Note: The source of the number of topic candidates: a comprehensive evaluation model is established from indicators such as reading volume of relevant topics on each platform, number of topic-selection votes, comparison of difficulty coefficients of competition questions, and attention to works. Various data were analyzed to establish a multiple regression analysis model, and the weight coefficients of each index were calculated.
Use the weight coefficient to bring in index data such as the number of readings of relevant topics on each platform, the number of votes for topic selection, the comparison of difficulty coefficients of competition questions, and the number of attention of works to evaluate the number of topic candidates. The results are for reference only. According to the previous estimated results and the real situation announced after the game, the accuracy is better.
Influence of mother's physical and mental health on infant growth
Summary
A mother is one of the most important people in a baby's life, providing not only nutrition and physical protection but also emotional support and a sense of security. Therefore, this article will focus on mother-to-baby sleep aspects.
Data preprocessing, data preprocessing for the dataset given in the title, including operations such as outliers and missing values. The processing of outliers is divided into human judgment and principle judgment. For human judgment, that is, find samples with logical problems and eliminate them. For the indicator data that obeys the normal distribution, the outlier is judged by the principle and eliminated.
Question 1, to determine whether there is a pattern, first draw a scatter diagram to roughly analyze the pattern of physical indicators and psychological indicators on behavioral characteristics and sleep quality. The pearson correlation coefficient was further introduced for analysis to determine whether there was a correlation between physical indicators and psychological indicators on behavioral characteristics and sleep quality.
Question 2. For the data given by the questionnaire results, firstly, the reliability and validity of the questionnaire are tested, and the results of the questionnaire are analyzed. Carry out data coding processing on the results of the infant's behavioral characteristics, and carry out quantitative conversion. A multiple linear regression model was established based on the mother's physical and psychological indicators and behavioral characteristics. The linear regression model is used to predict the behavioral characteristics of the last 20 groups of infants.
Question 3: Build an optimization model. The objective function is to minimize the cost of consumption, and the treatment costs of CBTS, EPDS, and HADS are used as constraints to build a model for solution.
Question 4, for the comprehensive evaluation of the baby's sleep quality, the entropy weight method is selected for evaluation. Threshold processing is carried out on the final comprehensive evaluation value, that is, the top 25% are identified as excellent; 25%-50% are considered good; 50%-75% are rated as fair; 75%-100% are rated as poor. For the correlation model between the baby's comprehensive sleep quality and the mother's physical indicators and psychological indicators, multiple multiple linear regression models were established to realize the prediction of the comprehensive sleep quality of the last 20 groups of infants.
Question 5 can be regarded as an extension of question 3. The new constraint condition of sleep quality rating is introduced to solve it. Using the threshold comprehensive evaluation model established in question 4, a specific sleep quality rating expression is obtained and a new optimization model is constructed. Solve.
Keywords: numerical processing, quality inspection, principal component analysis, regression analysis, optimization model
Huashu Cup Topic C Finished Paper Sharing
Link: https://pan.baidu.com/s/1L04241wO3128muSt2jalqw
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